Tractor



k P. J. GIETZEN TRACTOR.

APPLICATION FILED MAY17,19|9.

4 SHEETS-SHEET l- 1,345,166. PatentedJune 29,1920.

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' APPLICATION FILED MAY 17, 1919.

1,345,166, Patented June 29,1920.

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UNITED STATES PETER J. GIETZEN, OF GLEN ULLIN, NORTH DAKOTA.

TRACTOR.

Specification of Letters Patent. Patented June 29, 1920.

Application filed May 17, 1919. Serial No. 297,750.

To all whom it may concern:

Be it known that I, PETER J. GIE'rzEN, a

citizen of the United States, residing at.

Glen Ullin, in the county of Morton and State of North Dakota, have invented new and useful Improvement i ..T t f which the following is a specification.

This invention relates generally to an improvement in tractors, and more particularly to certain details of construction tending to an increased efficiency.

' The improved tractor is particularly designed as a four wheel drive, involving, in addition to the usual front and rear dlfferentials, an intermediate differential, provided with means whereby the same may be locked at Will against its differential function, to thereby insure an equal drive power to the front and rear wheels under all conditions,

A further object is the provision of a belt drive to be directly operated from the transmission, with means whereby such belt drive may be held in neutral, or operated in either direction. at will.

Another object is the provision of steering means whereby steering control may be had of the front wheels in all relative arrangements thereof, and without regard to -the forward differential.

The invention contemplates other details of improvement, which provide for effective control of the operating parts, a relatively more complete cooling system, and frame construction.

The invention will be described in the following specification. reference being had to the accompanying drawings, in which :--v

Figure 1 is a view in elevation of the im-' proved tractor.

Fig. 2 is a plan view of the frame and di'ive-wheels, showing the differentials in p ace.

Figs. 3 and 4 are views in elevation of the intermediate differential, showing the same locked and unlocked respectively.

Fig. 5 is an enlarged view of the front including side bars 1, meeting at the forward end in a head 2, and spaced at the rear ends to receive the rear-axle housings or springs. The engine 3, which aside from the details hereinafter noted may be of any specific description desired, is mounted on the forward portion of the frame, and the crank-shaft 4 thereof has the usual fly wheel 5 and contained clutch 6, whereby the shagt 7 of the transmission 8 may be operate The transmission 8 is of the usual construction and needs no special description herein. A detail of the invention having relation to the transmission, however, is a driving means for a belt-pulley 9, arranged at a convenient point for use. The shaft 10, on which this pulley is mounted, extends within the transmission casing, hearings in such wall being provided, and is provided within the said casing with a bevel gear 11. A sleeve 12 is keyed for sliding movement on a transmission shaft, and provided at the ends with be'vel gears 13, 14, either one of which may, through the use of a lever mechanism 15. be brought into driving engagement with the gear 11. Thus, at the will of the operator, the belt pulley may be driven in either direction, or held at rest, as will be obvious.

The forward wheels are driven through a front differential, as 16. which is of the usual four-pinion type. a The ring gear of such differential, as 17 is driven through a worm shaft 18, mounted in the differential casing, and in turn driven through a gear and worm drive 19 from the drive-shaft 20.

The front differential casing is provided with a ball-extension 21, mounted in a socket 22 in the frame head 2, whereby the front wheels may be controlled for steering purposes. The rear differential 23 is arranged as usual to directly include the rear wheel axles, and the drive shaft 20, intermediate In advance of the rear universal 25, the

drive shaft is provided with what may be termed an intermediate differential 26, of the usual four-pinion t e,'with the driven gears 27 secured on t e terminals of the drive-shaft sections. The operation through the intermediate differential will be apparent, but this differential is arranged so that it may be locked against service as a Marential to secure direct action through the drive shaft. For this purpose, the intermediate diflerential has an additional shaft 28, on which is arranged a pinion in mesh with one of the driven gears, as at 27. A second pinion 30 is keyed for sliding movement on this shaft 28, and adapted through operation of lever mechanism, indicated generally at 31, to be moved into or out of cooperation with the other driven gear 29. When the movable pinion 30 is in mesh with the driven gear 29, both gears 27 must turn as a unit, and the differential function is destroyed, but with the pinion 30 out of mesh with such gear 27, the differential is operative for the usual purpose.

The control of the differential described is important, as if the front Wheels are without good traction, while the rear Wheels have ood traction, the intermediate differential would permit the freely movable front wheels to absorb all power, and the tractor would not move. By looking the differential, however, the power is equally transmitted to the front and back wheels, and the rear wheels would take hold and move the tractor without regard to the traction of the front wheels. This condition, of course, holds good, if the above noted traction conditions are reversed. The important detail is the provision of means whereby the intermediate differential may be permitted to function, or prevented from functioning a a differential, at the will of the operator.

The steering wheel 32, mounted on the usual steering post, operates, through a gear and worm drive, 33, a lever, pivotally mounted on, a frame support. This lever 34, is connected by chains, or other flexible connectors 35 to the front axle housing, on

opposite sides of the front differential. As the steering mechanism is operated, the steering is accomplished through the bodily movement of the front differential casin in the ball-and-socket mounting describe The drive shaft, in the section in advance of the front universal, is formed to compensate for the steering movement of the front axle, by the provision of a key-slip or slide knuckle connection 36.

A cab 37 for the operator is mounted on the rear portion of the frame, and between the cab and engine is arranged the radiator 38. This radiator is made up of sections 39 removably connected together, and having air passages between them. The casing of the radiator, as 40 extends above the sections, as an outlet box 41, having a restricted discharge 42. The exhaust p1pe 43 from the engine cylinders leads into the outlet box, and out the discharge, thereby facilitating the drawing in of air between the sections of the radiator. The radiator has the usual circulating pipes leading to and from the engine, in one of which is arranged the usual positively driven water-pump 44, and in the return pipe 45, of which system is arranged a small standpipe 46, having a cap, and serving as a filling conveyer for the system.

The usual fuel feed system, here shown as a vacuum system 47, is employed, and any standard carbureter, air-cleaner may be also used, as desired.

It is preferred that the belt wheel or pulley 9, be used as a braking means for the tractor, such wheel being provided with a brake 48 so that when the brake is applied to said wheel 9, the driving wheels will be braked through means of the transmission mechanism.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is

A tractor comprising a frame having its side bars converging at their forward ends, a head carried by said ends, front and rear wheels supporting axles for the frame, a differential for each axle, an engine, means for connecting the same with the differentials, an upwardl extending ball extension on the housing 0 the front differential and the head having a socket for receiving said extension and steering means connected with the front axle.

In testimony whereof I afiixm si ature.

PETER J. G E ZEN. 

